Resetting method of wellhead device for uncontrolled blowout

A wellhead device and flange technology, which is applied in the field of blowout out of control wellhead device reset, can solve the problems of high risk and low efficiency, achieve the effect of reducing operation time, reducing the number of operations close to the wellhead, and improving operation efficiency

Active Publication Date: 2021-01-01
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method of resetting the wellhead device represented by the above-mentioned patent documents has many steps, and requires rescue personnel to work near the wellhead for many times and for a long time, with high risk and low efficiency

Method used

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  • Resetting method of wellhead device for uncontrolled blowout
  • Resetting method of wellhead device for uncontrolled blowout
  • Resetting method of wellhead device for uncontrolled blowout

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] As a preferred embodiment of the present invention, it discloses a method for resetting the wellhead device for blowout out of control, designing an integrated bottom flange for oil and gas well blowout out of control rescue, connecting it to the lower part of the new wellhead device, and resetting it with the wellhead The device pressurizes them into the optical sleeve 10 to realize clamping and sealing of the sleeve 10 .

[0035] When cutting the casing 10, use a beveling machine to cut off the casing 10, and at the same time pour out the bevel on the top surface of the casing 10, so that the integrated oil and gas well blowout out of control emergency bottom flange can be inserted into the casing 10, and the emergency bottom flange can be avoided. Damage to seals.

[0036] The bottom flange for out-of-control blowout rescue can be contracted or expanded according to the size of the installed casing 10. The spring 3 gives a fixed pre-tightening force to the slips 2. T...

Embodiment 2

[0039] As another preferred embodiment of the present invention, it discloses an integrated oil and gas well blowout out-of-control bottom flange, which includes: body 1, slips 2, spring 3, O-ring 4, spring pressure block 5, Skeleton sealing ring 6, anti-settling positioning block 8, the body 1 is provided with a conical inner cavity with a large upper part and a smaller lower part, the slips 2 are installed in the conical inner cavity and self-locking, and the middle part of the slips 2 is provided with a casing 10 passes through and matches the opening, the spring 3 is set on the upper part of the slip 2 and the spring 3 is pre-compressed by the spring pressure block 5, the O-shaped sealing ring 4 is installed on the outer ring of the spring pressure block 5, and the spring pressure block 5 is fixed on the body 1, the skeleton sealing ring 6 is installed in the inner ring of the spring pressing block 5, the anti-sinking positioning block 8 is placed on the upper part of the s...

Embodiment 3

[0044]As another preferred embodiment of the present invention, the disclosed slip 2 includes an upper part and a lower part that are fixedly connected together or integrally formed. The outer shape of the lower part is a cone 16, the upper part is larger and the lower part is smaller, and the upper part is a cylindrical shape. 15. There is a step 11 at the intersection of the lower part of the cylinder 15 and the cone 16. The inner diameter of the slip 2 is processed with evenly distributed teeth 17, and the inner diameter of the upper light hole is larger than the inner diameter of the teeth 17.

[0045] The shape of the lower part is a cone 16, the upper part is larger and the lower part is smaller, and the taper angle of the conical surface satisfies the self-locking function. The upper shape is a cylinder 15, and there is a step 11 at the intersection of the bottom of the cylinder 15 and the cone 16. The surface of the cone 16 and the step 11 is used to fix the preload spr...

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Abstract

The invention discloses an out-of-control blowout well head device reset method, and relates to the field of well head reset after casting pipe cutting or under the polished casting pipe condition when out-of-control blowout of an oil-gas well occurs. An integral oil-gas well out-of-control blowout emergency rescuing bottom flange is connected to the lower portion of a new well head device, the bottom flange is installed on a polished casting pipe in a pressurizing mode through a well head reset device, and casing pipe clamping and sealing are achieved; and when the casing pipe is cut, the casting pipe is cut with a bevelling machine, and meanwhile a beveled edge is chamfered on the top face of the casing pipe. According to the method, the reset steps of the out-of-control blowout well head device can be significantly reduced, the well head emergency installing operation efficiency can be improved, the near well head operation time of rescuers can be shortened, and the operation risk can be reduced.

Description

technical field [0001] The invention relates to the wellhead resetting of oil and gas wells after the blowout is out of control and the casing is cut or the casing is bare, and specifically relates to a method for resetting the wellhead device of the blowout out of control. Background technique [0002] When an oil and gas well blows out and catches fire out of control, the usual situation is that the wellsite equipment is damaged and the wellhead is damaged. The common practice of its emergency rescue is: wellhead, rescue equipment, personnel cooling cover, remove the equipment and facilities around the wellhead, and then cut the wellhead. Before cutting the wellhead, determine the cutting position of the wellhead according to the survey situation. If the bottom flange of the wellhead is not damaged, cut the wellhead from the upper four-way of the bottom flange of the wellhead, take the lower flange of the four-way and rush to install a new wellhead. If the bottom flange o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/03
CPCE21B33/03
Inventor 谢意湘刘贵义罗园刘正连王留洋赖向东罗卫华李红兵胡旭光段慕白
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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